Abstract
Abstract High Al saturation is one of the limiting factors to intensive cropping of many soils in the Cerrado of Brazil. A field study on the effect of lime rate and depth of incorporation on growth of corn ( Zea mays L.) was conducted on an Oxisol (Typic Haplustox) at Brasilia. Lime rates used were 0, 1, 2, 4, and 8 tons CaCO 3 /ha and depths of incorporation were 15 and 30 cm. Incorporation of 4 tons of CaCO 3 to a depth of 30 cm reduced Al saturation from 72% to < 5% on a soil which initially had 1.1 meq Al/100 cm 3 . Concentrations of soil solution Al decreased to very low levels at pH 5.5. Grain yields of three successive corn crops were increased by liming. Incorporation of lime to a depth of 30 cm resulted in higher yields than incorporation to a depth of 15 cm. Application of MgSO 4 to the acid soil increased yields above the nonlimed treatment. Yield responses to liming were due to improved Mg nutrition and neutralization of toxic Al. Root length was increased considerably in the 0‐ to 15‐cm depth and doubled in the 15‐ to 30‐cm depth when Al was neutralized by liming. Increased root development in the 15‐ to 30‐cm depth of the deep lime treatments resulted in greater water utilization from this depth and decreased the detrimental effects of moisture stress at tasseling on corn yields.
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Claims 10
Claim · model-written summary
Four tons of incorporated lime reduced soil Al saturation from 72% to below 5%.
- Taxon
- corn
Zea mays subsp. mayse1 - Treatment
- 4 tons of CaCO 3 to a depth of 30 cme0
- Outcome
- Al saturatione0
- Direction
- reducede0
- Value
- < 5%e0
- Qualifier
- 72%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Incorporation of 4 tons of CaCO 3 to a depth of 30 cm reduced Al saturation from 72% to < 5%”
e1“growth of corn ( Zea mays L.)”
Claim · model-written summary
Soil solution Al fell to very low levels at pH 5.5.
- Taxon
- cornZea mays subsp. mayse1
- Outcome
- Concentrations of soil solution Ale0
- Direction
- decreasede0
- Qualifier
- pH 5.5e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Concentrations of soil solution Al decreased to very low levels at pH 5.5”
e1“growth of corn ( Zea mays L.)”
Claim · model-written summary
Liming increased grain yields of three successive corn crops.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- liminge0
- Outcome
- Grain yieldse0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Grain yields of three successive corn crops were increased by liming”
Claim · model-written summary
Thirty-centimeter lime incorporation gave higher corn yield than 15-centimeter incorporation.
- Taxon
- cornZea mays subsp. mayse1
- Treatment
- Incorporation of lime to a depth of 30 cme0
- Outcome
- yieldse0
- Direction
- highere0
- Comparator
- incorporation to a depth of 15 cme0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Incorporation of lime to a depth of 30 cm resulted in higher yields than incorporation to a depth of 15 cm”
e1“growth of corn ( Zea mays L.)”
Claim · model-written summary
MgSO 4 increased yield over the untreated acid soil.
- Taxon
- cornZea mays subsp. mayse1
- Treatment
- Application of MgSO 4e0
- Outcome
- yieldse0
- Direction
- increasede0
- Comparator
- nonlimed treatmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Application of MgSO 4 to the acid soil increased yields above the nonlimed treatment”
e1“growth of corn ( Zea mays L.)”
Claim · model-written summary
Authors attributed corn yield response to better Mg nutrition and neutralized toxic Al.
- Taxon
- cornZea mays subsp. mayse1
- Treatment
- liminge0
- Outcome
- Yield responsese0
- Qualifier
- improved Mg nutrition and neutralization of toxic Ale0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Yield responses to liming were due to improved Mg nutrition and neutralization of toxic Al”
e1“growth of corn ( Zea mays L.)”
Claim · model-written summary
Liming increased root length considerably in the upper 15 cm.
- Taxon
- cornZea mays subsp. mayse1
- Treatment
- liminge0
- Outcome
- Root lengthe0
- Direction
- increasede0
- Qualifier
- 0‐ to 15‐cm depthe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Root length was increased considerably in the 0‐ to 15‐cm depth and doubled in the 15‐ to 30‐cm depth when Al was neutralized by liming”
e1“growth of corn ( Zea mays L.)”
Claim · model-written summary
Liming doubled root length at 15 to 30 cm depth.
- Taxon
- cornZea mays subsp. mayse1
- Treatment
- liminge0
- Outcome
- Root lengthe0
- Direction
- doublede0
- Qualifier
- 15‐ to 30‐cm depthe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Root length was increased considerably in the 0‐ to 15‐cm depth and doubled in the 15‐ to 30‐cm depth when Al was neutralized by liming”
e1“growth of corn ( Zea mays L.)”
Claim · model-written summary
Deep liming increased water use from 15 to 30 cm depth.
- Taxon
- cornZea mays subsp. mayse1
- Treatment
- deep lime treatmentse0
- Outcome
- water utilizatione0
- Direction
- greatere0
- Qualifier
- 15‐ to 30‐cm depthe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increased root development in the 15‐ to 30‐cm depth of the deep lime treatments resulted in greater water utilization from this depth”
e1“growth of corn ( Zea mays L.)”
Claim · model-written summary
Deep liming reduced moisture stress damage to corn yield at tasseling.
- Taxon
- cornZea mays subsp. mayse0
- Outcome
- detrimental effects of moisture stress at tasseling on corn yieldse0
- Direction
- decreasede0
- Qualifier
- moisture stress at tasselinge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“decreased the detrimental effects of moisture stress at tasseling on corn yields”
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See all 219 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.